CHRISTINA AGUILERA

Sure, Xtina can silence a room with her powerhouse voice alone, but we couldn't stop talking about her x-cellent body after she took the stage at May 19's Billboard Music Awards showing off her continued weight loss. "It's amazing what having some personal time can do, not only for the body but also for the mind and spirit," a source told PEOPLE of the former The Voice coach in March. "She has been trying new types of foods and exploring new methods of exercise. Not for diet or weight, but more for her mind and well-being and overall sense of good health."